Interesting idea. There must be a relatively easy way to meke them self canceling, another option that may work better than a buzzer.

Grok:

Here are some popular options based on reviews and discussions:

• Smart Turn System (STS or ST2 Turn System): This compact module is designed for universal motorcycle use and cancels signals automatically after detecting a completed turn via motion sensors. It's praised for reliability and ease of installation (splicing into the turn signal wiring, no need for additional switches). Price is around $99. It's been successfully installed on various bikes, and while not specifically marketed for the Grom, its universal design should work without issues.
• Signal Dynamics Self-Canceling Turn Signal Module: A plug-and-play replacement for your existing flasher relay that adds auto-cancellation based on time or distance. It's universal for 12V systems, compatible with LED or incandescent signals, and includes hazard flasher functionality. Costs about $50–$70 and is straightforward to install.
• Custom Dynamics Universal Auto-Cancel Turn Signal Module: Adds self-cancellation and four-way hazard flashers. It's universal for early or non-equipped bikes, works with 12V systems, and cancels after a set time or distance. Around $60–$80, with easy wiring integration.
• Badlands Automatic Turn Signal Canceling Module: A simple add-on that provides self-cancellation without needing OEM modules. Universal for most bikes, it plugs in and uses timing to cancel signals. Priced at $50–$100.

Before purchasing, verify compatibility with your Grom's year (e.g., 12V electrical system) and signal type (stock or LED). Installation usually involves basic tools, soldering or crimping wires, and following the module's instructions—expect 30–60 minutes. If you're not comfortable with wiring, consult a mechanic. Check motorcycle forums like Reddit's r/motorcycles or r/HondaGrom for user experiences, as some have added these to similar Honda models like the Rebel.

Motorcycle Turn Signal Modules | Converters, Decoders & More | Custom Dynamics

Upgrade your ride with signal modules designed to enhance functionality, streamline wiring, and support a variety of LED lighting applications.

www.customdynamics.com

Home - ST2 Systems

MAKING MOTORCYCLES SMART And your RIDING experience better ST2: TURN System An advanced self-canceling turn signal device.Never worry about your turn signals again.The ST2 Turn System delivers unrivaled accuracy. FIND OUT MORE ST2: BRAKE MODULE The ST2 Brake Module flashes your brake light when...

st2-systems.com

 

you can fit a piezo buzzer in parallel with your indicators, you will either need 2 (L and R) or use a couple of diodes in the feed, otherwise your indicators would become hazzard lights .You can get various prewired kits of fleabay for not much more than making your own. Problem I had when I tried this was finding somewhere discrete to mount the buzzer where I could hear it with full face lid on, in the end I gave up

 

I really like my ST2 system on my Monkey

If you install this piece use the thicker little pieces of foam. They wear out a bit so over time the thinner pieces want work as good anymore.

 

Hi Rob yes i fitted one of those buzzers,
i was forever forgetting to cancel mine !
i got mine of Evilbay for £5.17 free post
MOTORBIKE INDICATOR WARNING BUZZER , A MUST HAVE fits most Motorbikes
not sure if it's water proof but i have had a hosepipe on mine and it still works fine,
eBay item number:251555295221
took about 30 minutes to fit, i have mine stuck to the top headstock just
under my handle bars, it's quite loud !!!!!!!!
i wear earplugs with open face helmet and can hear it no problem !
plus I have found that people walking can also hear me turning and
stop at the curbside and turn round before crossing
just be careful who you buy from as the same one i got
is being sold by others for £14.99

 

Thanks for all of the replies. Thanks for the link monkeynut...they offered iot to me for £4.66....bargain. I'll try it out and then probably fit one to all of my bikes!!. I've unfortunately got a lot of bike repairs to do at the moment....the problems of an ageing fleet .

 

I've unfortunately got a lot of bike repairs to do at the moment....the problems of an ageing fleet .

Welcome to the club! I struggle to have between 4 to 6 bikes running which I can pick for the task.
And about 10 ongoing projets, some stalled over 10 years. Total number of bikes ? Good question, I don't know, must be between 35 and 40, maybe more.
Greetings from Luxembourg, Gabby aka Mitch41.

 

£4.66 ? That's it i'm off to Evilbay,
I paid £5.17 i'm just putting my complaint in writing !
Only joking i hope your as pleased with yours as i'm with mine !
just place it facing you if possible ?
my shed is 107 feet from my bungalow and the wife could
easily hear it in the front room with the TV on
best to use the sticky pad so you can move it about till its
right for you

 

I have my FJ1200 in bits at the moment and as I have access to the front indicatotr I wired up thge beeper........wow, how loud. I'm just going to stick it inside the fairing. As you said, I can imagine pedestrians hearing it. Once upon a time I would have hated the idea of a buzzer, but after 44 years of biking and traffic being what it is I'm becoming more sensible.... (ish). Once again, a great find...thanks.

 

Glad you like it !
as you say years ago I was the same,
( look at that plonker with a BUZZER )
i bet that's wot the younger generation thinks about me ???
but since I installed mine i have NEVER forgot
to cancel mine, so worth every penny